Every other manager in the Premier League would envy Roberto Mancini’s selection dilemma ahead of the Manchester derby: he must select two from Edin Dzeko, Mario Balotelli, Carlos Tevez and Sergio Aguero. That’s over £00m worth of talent. Crucially, each player offers something different, meaning Mancini can alter the balance of the side subtly. Dzeko is a penalty box presence …